Levi hasn’t made a child support payment for the ex-couple’s son Tripp since June 2010 … 22 months ago.

According to court records, Levi is required to pay $1,750 a month — which means his outstanding balance is $38,500.

As for why Bristol hasn’t attempted to enforce the order — via wage garnishment or otherwise — Bristol’s attorney tells us, “We forbore pursuing child support collection in the (perhaps naive) hope that Mr. Johnston would do what men are supposed to do and pay his support obligation voluntarily.”

Some fun facts: Sarah Palin was pregnant with her first child when she eloped with her husband. That child, Track, married his heavily pregnant girlfriend last year. Bristol got knocked up at 17. And while it was a different time, even Sarah’s mother was “with child” when she got hitched.

Sure, three of those unexpected pregnancies resulted in (apparently) happy marriages. But one of them lead to this: publicly shaming a white trash baby daddy into supporting his child. If 1 in 4 are the best odds abstinence education can give us, I’ll take the school nurse demonstrating how to put a condom on a banana any day.